<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <!--添加角色按钮区域-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表区域-->
      <el-table :data="rolesList" border stripe>
        <!--展开列-->
        <el-table-column type="expand">
          <template #default="scope">
            <el-row :class="['bdbottom',i1===0 ? 'bdtop' :'','vcenter']" v-for="( item1, i1 ) in scope.row.children" :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二和三级权限-->
              <el-col :span="19">
                <el-row :class="[i2===0 ? '' :'bdtop','vcenter']" v-for="( item2, i2 ) in item1.children" :key="item2.id">
                  <!--渲染二级权限-->
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!--渲染三级权限-->
                  <el-col :span="18">
                    <el-tag :class="[i3===0 ? '' :'bdtop']" type="warning" v-for="(item3,i3) in item2.children"
                            :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!--索引列-->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" prop="level" width="300px">
          <template #default="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting"
                       @click="showSetRightDialog(scope.row)">分配权限</el-button>
            <el-tag v-if="scope.row.level ==='0'">一级</el-tag>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!--分配权限的对话框-->
    <el-dialog title="分配权限" :visible.sync="showSetRightDialogVisible"  width="50%" @close="setRightDialogClosed">
      <!--树形控件-->
      <el-tree :data="rightlist" :props="treeProps" show-checkbox node-key="id" default-expand-all
               :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="showSetRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data () {
    return {
      //  所有角色列表数据
      rolesList: [],
      //  权限管理对话框的
      showSetRightDialogVisible: false,
      //  点击分配权限获取到的权限数据
      rightlist: [],
      //  树形控件树形绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //  默认勾选的权限
      defKeys: [],
      //  即将分配权限的角色id
      roleId: ''
    }
  },
  created () {
    //  获取权限
    this.getRolesList()
  },
  methods: {
    //  获取角色列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('获取角色列表失败！！')
      } else {
        //  请求成功
        this.rolesList = res.data
        this.$message.success('获取角色列表成功！！')
      }
    },
    //  删除权限
    async removeRightById (role, rightId) {
      //  弹框提示用户是否删除
      const confrimResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confrimResult !== 'confirm') {
        return this.$message.info('取消了删除权限！！')
      } else {
        //  发起删除权限请求
        const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200) {
          //  删除失败
          return this.$message.error('删除权限失败！！')
        } else {
          //  删除成功
          /* this.getRolesList()调用这个函数户刷新页面，不建议使用 */
          //  重新赋值权限
          role.children = res.data
          this.$message.success('删除成功！')
        }
      }
    },
    //  分配权限按钮的点击事件
    async showSetRightDialog (role) {
      this.roleId = role.id
      //  获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        //  获取失败
        return this.$message.error('获取权限失败，清刷新页面！！')
      } else {
        //  获取成功
        this.rightlist = res.data //  把获取到的数据保存到rightlist中
        this.$message.success('获取权限成功！')
      }
      //  递归函数获取三级权限的节点
      this.getLeafKey(role, this.defKeys)

      this.showSetRightDialogVisible = true
    },
    //  递归函数获取三级权限的节点
    getLeafKey (node, arr) {
      if (!node.children) {
        //  三级节点
        return arr.push(node.id)
      } else {
        //  不是三级节点
        node.children.forEach(item => this.getLeafKey(item, arr))
      }
    },
    //  监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      //  清空之前保留的id
      this.defKeys = []
    },
    //  分配权限确定按钮的点击事件
    async allotRights () {
      //  拿到所有全选、半选中的权限
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('分配权限失败，请重新分配！！')
      } else {
        //  请求成功
        this.$message.success('分配权限成功！！')
        this.getRolesList()
        this.showSetRightDialogVisible = false
      }
    }
  }
}
</script>

<style lang="less" scoped>
.bdtop{
  border-top: 1px solid #eee;
}
.bdbottom{
  border-bottom: 1px solid #eee;
}
.vcenter{
  display: flex;
  align-items: center;
}

.el-tag{
  margin: 7px;
}

</style>
